Magneto-electric generator



Dec 24, 1929. E. B. NOWOSIELSKI 1,741,137

MAGNETO ELECTRIC GENERATOR Filed April 22, 1924 2 Sheets-Sheet lINVENTOR [aw/1:0 5. MWdS/ILS'K/ A rmmvsr Dec. 24, 1929. E. B.NOWOSIELSKI MAGNETO ELECTRIC GENERATOR Filed April 22, 1924 2Sheets-Sheet 2 Patented Dec. 24, 1929 UNITED STATES PATENT OFFICE EDWARDB. NONOSIELSKI, OF BLOOIVIFIELD, NEW JERSEY, ASSIGNOR TO SYLITDORFELECTRICAL COMPANY, OF NEWARK, NEW JERSEY MAGNETO-ELECTRIC GENERATORApplication filed April 22, 1924. Serial No. 708,138.

. My invention relates to electric generators, particularly of themagneto type used for ignition purposes on internal combustion engines.In my Patent 1,477,8 1? issued Decemher 18, 1923, I have shown anddescribed the fundamental form of generator in which there is a primarymagnetic field structure, comprising the permanent magnets and polepieces associated therewith; a secondary magnetic field structure,comprising a coil core structure with pole pieces associated therewith;and a rotor movable between the two fields structures for producing fluxchanges in the secondary field structure. In

t my previously mentioned patent, one generatmg 0011 is used which isplaced within the arch of the magnets substantially parallel to the axisof the rotor.

It is the principal object of my present application to improve on thearrangement shown in my previously mentioned patent by utilizing to thegreatest extent that I now know to be possible, the same base and rotorstructure to obtain a generator having the ability to deliver twosimultaneous sparks where only one was possible before. Or

stated in another way, it is the object of this invention to producewith the same fundamental parts a double generator for the purpose ofobtaining twice as many sparks with substantially no increase in weight.

It will be apparent at once that the accomplishment of such an objectmeans considerable not only in the cost of equipment, but in the weightcarried by an aeroplane engine;

the idea being to eliminate one of the magnetos, it being customary touse double ignition units in order primarily to secure a large factorofsafety. Ordinarily the high tension coil in an ignition unit isthemost vulnerable drives that must be provided from the engine, therebyreducing the cost and simplifying the installation.

Another object of my invention is to provide an arrangement of the partsso that they the means of locking the two parts of the coil corestructure together.

Figure 5 is a schematic drawing of the circuits of the machine; whileFigure 6 is a diagrammatic illustration of the switch lever used inconnection with the switch shown in Fig. 5.

Referring now to the details wherein like numbers refer to correspondingparts in the various views, 1 is a base or housing structure withinwhich the rotor 2 is positioned, being supported on bearings at eitherend, one bearing 3 being carried in the drive end plate 4 and the otherbearing 5 being carried in the end plate 6. These plates are fastenedtogether and to the base or housing 1 by means of suitable throughbolts, two of which are shown at 7 and 8. The housing 1 carries polepieces on which rest the magnets 9, all as described in my previouslymentioned patent, and a cover 10 for covering and clamping the magnetsin place is held to the base by the eye bolts 11 and clamping nuts 12.The magnets with their associated pole pieces constitute what may betermed the primary magnetic field. A secondary magnetic field iscomposed of the coil core structure with the two stationary pole pieces18 and 14 which are positioned in tandem in the top of the rotorhousing. Positioned on these pole pieces is a core structure made up oftwo parts 15 and 16 which are shown in dott d lines under the generatingcoils 17 and 18. C ne end oi? the core tor ninates in pole face thatengages the pole piece 13, and the lower end of the core 16 terminatesin pole face 20 that engages the pole piece 1 1. The upper end of thecore 15 is constructed to form what is equivalent to a bent end 21 andthe other end of the core 16 is constructed to form what equivalent to abent end 22. The ends 21 and 92 are preferably shaped somewh dovet. ilas indicated at 23 (see 1) and a clamping; date 531 is adapted to passover these ends so that when the nut 25, on the hold-down bolt 28fastened to the base, is tightened, the core ends 21 and 22 are drawnsolidly together and the core faces 19 and 20 are clamped against thepole pieces 13 and 1 1-. it bei understood that there are two of thehold-down bolts W3, one on either side of the core. In addition to thehold-down bolts 26, clamps 2'? and 28 may also be utilized to assist inholding the coil and core structures in position.

The distribution of the magnetic flux oi? the magnets 9 by means of therotor through the coil and core structure will not be 'iirther describedherein, as it is clearly set forth in my previously mentioned patent,but in my present application each the coils 1'5 and 18 is made up ofprimary P and secondary S, which is the ordinary construction of a hightension coil. Both ends of the primary are insulated from the core andbroup'ht out,

one end 01": the primary 1'? to a terminal. carries in a block ofinsulating material 30 and the corresponding end of. the other primarycoil to a terminal 31. One end of the primary winding P of the coil 1?is brought out to a condenser terminal 82 and by means of a conductor 33to an insulated adjustable contact 8 1, which cooperates with a contactcarried by a movable breaker arm 3f The breaker arm 36 is pivotallymounted on a stud carried on a circuit breaker plate 37. Thecorresponding end of the primary oi? coil 18 is brought out to acondenser stud 88 and by means of a conductor 39 continued on to theinsulated adjustable contact 10, which cooperates with the movablecontact 41 carried on the circuit breaker lever d2, which also ispivoted to the breaker plate 37.

The two condensers are illustrated by the numbers and ll, the oppositeends of which are grounded on the frame of the magneto through amounting clip 45 carried on the stud 16. The circuit breaker levers 36and 12 are actuated simultaneously by the cam 4.? carried on the end ofthe rotor shaft. One end of each of the secondary windings is groundeddirectly to the core, while each of the other ends is brought out, oneto the ter minal 18 and the other to the terminal 19 carried in theblock of insulating; material 30, from which terminals connections aretaken to independent distributor's mounted on and driven by the engine.The terminal block 30 is carrieo on a cover plate 50, on the lower partof which is mounted a breaker cover plate 51, which as illustrated isscrew threaded into a hole in the plate 50, lugs 5 body; on the plate 51for assisting in screwing the cover into position in the plate Ii.advance and retard is desired, the plate 51 is prorided with a stubshaft 52 to which an advance lower 66 is attached. Elie inner end oi thestub shaft 5:2 has a connecting link 53 that is adapted to engage stud 51: which is securely fastened to the circuit breaker plate 37, thislatter plate being held in position by the studs passing through theslots 58 in the breaker plate. In some cases the driving end plate 1 isprovided with a dowel 57, for fitting in an engine plate, and lugs o8having slots 59 therein by means of which the herd structure of the magneto may be shifted with respect to the rotor for timing; with theengine. lVhen the lever 6 is not used. then the circuit breaker plate 37is fastened in a lined position to {rive the maximum result from thecoil wini'lings. The circuit breaker lo ers 36 and 42 are each providedwith a felt wiper 60, which is oiled and this carries a certain amountof lubricant to the cam that may be made of any suitable materia Iprefor to use in the arrangement herein described a cam made of hardinsulating material.

The control of the magneto is brought about through the medium of aswitch which is diagrammaucally illustrated as 61. The switch lever, asshown in Fig. 6, is made up 01" contact levers 6:2, (33 and 6s. Theswitch lever is permanently grounded to the frame of the switch, whichin turn is grounded, and by grounded I mean connected to some part ofthe engine framework. It will be apparent that when the switch lever andthe contacts (i2, and 6d are in the position A (Fig. 5) the ends oi bothprimary windings are grounded, and both coils then deliver sparks fromtheir secondary winding". In the position B, the switch blade (33 is outof contact and only the blades 62 and (34: make engagement, therebygrounding only the primary of coil 18. In the position C, the coil 18 isout out due to the prin'iary being o en circuited and the coil 1? alonefunctions; while in position D of the switch both primaries are opencircuited and the generator is rendered inert. This arrangement allowsthe operator to test either one of his coils to see that they are bothin good working condition, which is highly essential for aviation work.

It might be further mentioned that while the lugs 58, with theirassociated slots 59, are used for timing the magneto with the enginewhen the advance lever 66 is not used and the circuit breaker plate 317is held in a fixed position, the lugs are also used. for clamping themagneto to the engine mounting plate in which the dowel 57 fits.

While I have shown one preferred arrangement of the parts entering intomy invention, it will be clearly apparent that the details may be variedover a wide range and I, therefore, do not wish to be limited, except aslimited by the claims appended hereto.

Having thus described my invention, what I claim is:

1. In a magneto electric generator of the type described, a basestructure forming a housing carrying a rotor therein and having a pairof pole pieces fixed in tandem in the top of the housing and forming apart thereof, a core structure carried on said pole pieces with meansincluding said rotor for shifting magnetic flux through said core;further characterized in that, the core structure comprises two limbseach having at one end a pole face engaging one of'said pole pieces setin the housing and at the other end a bent portion, with means forclamping said bent portions securely together, said clamping means alsoassisting in holding the core structure to said pole pieces set in thehousing, and further characterized in that each limb care ries a primaryand secondary winding thereon, independent breaker contacts forcontrolling each of said primary windings and each secondary adapted tobe connected to independent distributors as and for the purposedescribed. i

2. In a magneto electric generator of the type described, a basestructure forming a housing carrying a rotor therein and having a pairof pole pieces fixed in tandem in the top of the housing and forming apart thereof, a core structure carried on said pole pieces with meansincluding said rotor for shifting magnetic flux through said core;further characterized in that, the core structure comprises two partshaving portions to engage said pole pieces set in the housing and alsohaving portions adapted to be brought to-' gether with means for drawingand holding together said two portions and the two parts to said polepieces and further characterized in that each part of said core carriesa primary and secondary winding, an independent set of breaker contactsfor controlling each primary winding with an associated condenser andeach secondary being adapted for connection to independent distributers.

3. In amagneto electric generator, a primary magnetic field structure, astationary secondary magnetic field structure composed of a pair of polepieces and a two part core structure mounted on said pole pieces andprovided with means for holding said core structure together and to saidpole pieces, a rotor movable between said two field structures forproducing flux changes in the secondary field structure, a primaryWinding on each part of core structure, an independent set of breakercontacts for controlling the said primary winding on each part of thecore with an associated condenser and a secondary winding on each partof the core structure and adapted to be connected each to its owndistributer.

4. A double magneto electric genertor comprising two independent polepieces and a tWo part core structure securely held together and to saidpole pieces, a rotor for carrying magnetic flux to said pole pieces andcore structure, primary and secondary windings on each part of the corestructure, two independent circuit breakers and condensers connected oneeach to one end of each of said primaries, the other end of saidprimaries being brought out and adapted to be grounded both together orseparately or open circuited by a control switch, one end of saidsecondaries being brought out for connection to independent currentdistributers, and means carried by the rotor structure for actuatingsaid circuit breakers.

In testimony whereof, I aifix my signature.

EDWARD B. NOWOSIELSKI.

